JP4094351B2 - Engine mount - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine mount provided with a resin bracket, and more particularly, to an engine mount that can cope with a large displacement during an impact or the like. Here, the large displacement means that when a large impact load is applied to the vehicle body, the vehicle body and the engine have an abnormally large relative displacement, and the displacement on the engine side cannot be stopped only by elastic deformation of the anti-vibration rubber, A large displacement that must be received directly on the resin bracket side.
[0002]
[Prior art]
Engine mounts with resin brackets are known. While the resin bracket can be reduced in weight, it requires the addition of a reinforcing rib shape, etc., so that strength and rigidity are not insufficient, and the insert is integrated with the mounting seat so that bolt fastening does not occur at the fastening part with the vehicle body side. ing.
[0003]
[Problems to be solved by the invention]
By the way, when the displacement is large, the inner cylinder integrated with the vibration isolating rubber hits the resin bracket and is likely to be destroyed, so a high strength structure that can prevent this may be required. As a countermeasure for this, it is conceivable to add a reinforcing rib shape to the resin bracket. However, there is a case where there is no space for providing a reinforcing rib sufficient to obtain sufficient strength due to restrictions on the layout.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to make it possible to easily form a high-strength portion on a resin bracket, and to make it easy to form even under layout restrictions.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the engine mount according to claim 1 of the present application supports the engine via an anti-vibration rubber provided on the resin bracket, and an engine support portion is provided in the anti-vibration rubber support surface of the resin bracket. In the engine mount configured to be displaceable in a direction opposite to each other, only one of the opposite directions of the engine support point in the vicinity of the vibration isolating rubber of the resin bracket is provided with a stopper and a mounting seat. Is made into a high- strength part as an integral metal insert , the other side is made into a high-rigidity part reinforced with a rib shape, and the area of the portion where the high-strength part is provided is provided with the high-rigidity part It is smaller than the area of the part .
[0005]
Claim 2 is the upper Symbol claim 1, the resin bracket includes a bracket body portion for supporting the vibration damping rubber, and a mounting flange for attachment to the support member, substantially has and the mounting flange such the bracket body L The metal insert is characterized in that a stopper inserted into the main body and a mounting seat inserted into the flange are substantially L-shaped.
[0006]
A third aspect is characterized in that, in the first or second aspect, the metal insert has a positioning structure during resin molding.
[0007]
According to a fourth aspect of the present invention, in the first or second aspect, the metal insert has a structure for strengthening a bond with a resin through a through hole.
[ 0008 ]
【The invention's effect】
According to the first aspect, when the inner cylinder abuts against the resin bracket due to a large displacement, the resin bracket in the vicinity of this portion is integrated with a metal stopper to form a high-strength portion, so that cracking can be prevented. . In addition, since the stopper is formed integrally with the mounting seat and is attached to the support member by the mounting seat, the rigidity is further increased. In addition, by integrating the stopper and the mounting seat, the functions of these two members are combined, so the number of parts can be reduced.
In particular, according to the present invention, even if the area of the portion where the high-strength portion is provided is smaller than the area of the portion where the high-rigidity portion is provided, the stopper and the mounting seat are integrated to provide strength and rigidity. Can be increased as much as the high-rigidity portion, and it can be realized in a small space.
In addition, by providing a high-strength portion on one side of the resin bracket with the vibration-proof rubber sandwiched and a high-rigidity portion reinforced with a rib shape on the other side, the resin bracket can be adjusted according to the input direction to the vibration-proof rubber. The characteristics can be different. In addition, the use of a metal insert with an integral mounting seat makes it possible to easily provide the high strength portion.
In addition, since the high-strength part is provided in a portion smaller than the area where the high-rigidity part is provided, a small area that does not allow sufficient rib shape reinforcement to obtain the required strength due to layout restrictions. A sufficiently large strength can be given to the portion.
[ 0009 ]
According to the second aspect of the present invention, the substantially L-shaped insert in which the stopper and the mounting seat are integrated is integrated into the substantially L-shaped resin bracket in which the bracket body and the mounting flange are integrated. Sufficient support rigidity can be imparted despite cantilever support, and it can sufficiently withstand a swinging motion with the mounting portion of the mounting flange as a fulcrum and the engine connecting portion of the bracket body as the operating point.
[ 0010 ]
According to the third aspect, since the insert has a positioning structure during resin molding, the stopper function can be effectively exhibited by the positioning structure when used as an engine mount after resin molding.
[ 0011 ]
I in claim 4 lever, metallic inserts, since it has a binding strengthening structure to the resin by the through holes, the resin during resin molding connect consecutively front and rear coupling reinforcement portion through these through-holes The strength and rigidity can be increased by strengthening the integration with the high strength part.
[ 0012 ]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment will be described below with reference to the drawings. 1 is a plan view of the engine mount according to the present embodiment (shown from above in FIG. 2), FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, and FIG. 3 is a sectional view taken along line 3-3 in FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a perspective view of the stopper.
[ 0013 ]
In these drawings, an engine mount 1 is an inner cylinder 2 for connecting to a hanger H (FIG. 3) of an engine E as a vibration source, a vibration isolating rubber 3 elastically supporting the inner cylinder 2, and an outer peripheral portion of the vibration isolating rubber 3. The resin bracket 5 is integrally formed with a bracket main body 6 provided with a vibration isolating rubber 3 and a mounting flange 7 for mounting to the vehicle body F, and has a substantially L-shaped cross section (see FIG. 3). ).
[ 0014 ]
As shown in FIG. 3, the mounting flange 7 overlaps with the support portion of the vehicle body F on the vibration receiving side, and is fixed with bolts 8 and nuts 9. The bracket body 6 projects from the vehicle body F, and the hanger H of the engine E is fixed to the inner cylinder 2 supported by the bracket body 6 with bolts b and nuts n. The engine mount 1 is cantilevered to the vehicle body F and supports the engine E. The inner cylinder 2 forms a support portion for the engine E.
[ 0015 ]
As shown in FIG. 1, the mounting flange 7 portion 6 is provided with three mounting seats reinforced with metal inserts 10, 11, and 12. Among them, the insert 10 is an integrated stopper which will be described later, and the inserts 11 and 12 have a general collar structure.
[ 0016 ]
The anti-vibration rubber 3 is made of a known rubber material, and the inner cylinder 2 and the outer peripheral portion 13 of the anti-vibration rubber 3 are connected by a pair of rubber feet 4 extending to the opposite side across the inner cylinder 2. In the following description, the rubber foot 4 is substantially V-shaped, and a straight line C1 passing through the rubber feet 4 and 4 and the center of the inner cylinder 2 is orthogonal to the Y axis in the same plane and the center of the inner cylinder 2 A straight line C2 passing through the X axis is taken as an X axis, and a central axis line of the inner cylinder 2 orthogonal to these is taken as a Z axis. The plane by the X and Y axes is parallel to the support surface of the engine E in the bracket body 6 and the X axis direction is also the direction of movement of the engine support at the time of large displacement.
[ 0017 ]
The outer peripheral portion 13 has a substantially square shape, and is formed integrally with the peripheral edge portion of the substantially square mounting hole 14 formed in the bracket main body portion 6 and raised on the edge portion thereof. Further, projecting portions 15 and 16 projecting toward the inner cylinder 2 are formed on the A and B direction sides of the outer peripheral portion 13, and a thick portion 17 formed around the inner cylinder 2 as a part of the vibration isolating rubber 3. A predetermined gap is formed.
[ 0018 ]
Since there is no rubber foot 4 on the X axis, the inner cylinder 2 can be relatively moved in the opposite A and B directions on the X axis. When the inner cylinder 2 moves relative to the resin bracket 5 in the A and B directions on the X axis, the elastic deformation of the rubber feet 4 and 4 or the thick portion 17 comes into contact with the projecting portion 15 or 16 and the elastic bodies When the movement can be stopped by the contact, the movement is referred to as normal vibration. A movement that cannot be stopped only by the elastic force of these elastic members but is directly received by the bracket body 6 is referred to as a large displacement. The movement in the Y-axis and Z-axis directions is set so that it can be stopped by elastic deformation of the rubber feet 4 and 4.
[ 0019 ]
The resin bracket 5 is made of an appropriate resin material such as nylon, and is molded by a known method such as injection molding. As shown in FIG. 1, the X-axis direction is longer than the Y-axis direction. The left half side, which is the A direction side, forms a high-strength portion 18 that can withstand the large displacement of the inner cylinder 2, and the right half side, which is the B direction side, forms a highly rigid and easily cracked portion 20. Note that due to layout restrictions, the large-strength portion 18 side is formed in a smaller area than the high-rigidity easily cracked portion 20 side.
[ 0020 ]
The high-rigidity easily cracked portion 20 is integrally formed with ribs 21 and has a high-rigidity structure that provides sufficient rigidity to support the engine E by partially forming a thick-walled structure. Further, a weld line 22 is formed so as to cross the rib 21, and a slot hole 23 penetrating the rib 21 in the Z-axis direction is formed. The slot hole 23 has a long hole shape whose opening is long in the Y-axis direction. Each of the weld line 22 and the slot hole 23 has a weakened structure, and serves as a starting point of cracking at the time of the large displacement, thereby making it easy to crack the highly rigid easily cracked portion 20.
[ 0021 ]
The slot hole 23 has an asymmetric shape with the weld line 22 in between. In this embodiment, the mounting flange 7 side is relatively smaller than the weld line 22 and the opposite side is an enlarged opening. If it does in this way, since a big opening side becomes weaker, a crack can be induced to that side. Therefore, the crack direction can be freely set by adjusting the size and shape of the opening. The slot hole 23 has a rounded shape as a whole, and is curved so that the intermediate portion is convex toward the side opposite to the antivibration rubber 3 as shown in FIG.
[ 0022 ]
In the injection molding or the like, the weld line 22 is formed at a place where the resin that has been shunted and circulated in the mold meets, and reduces the strength of the molded product, and becomes a weak body part that becomes a starting point of cracking at the time of large displacement. The position of the weld line 22 can be formed at an arbitrary position by setting the injection port or the like. In this embodiment, the weld line 22 is formed long from the edge of the mounting hole 14 to the end in the B direction.
[ 0023 ]
As shown in FIG. 5, the insert 10 is a substantially L-shaped member made of an appropriate metal such as iron or light alloy, in which a collar portion 24 and a stopper portion 25 extending from the collar portion 24 are integrated. It is formed by forging, etc., and the section modulus of each part can obtain a strength that can sufficiently withstand a large displacement or an engine support load.
[ 0024 ]
A through hole 26 for the bolt 8 is formed in the collar portion 24, and of the left and right seat surfaces 27, 28 in FIG. Is called the inner surface). The substantially side seating surface 28 protrudes to the vehicle body side by a slight amount h from the opposite side surface (hereinafter referred to as the outer surface) of the mounting flange 7 to prevent the resin from sagging during fastening. The collar portion 24 is substantially circular as viewed from the central axis direction of the through hole 27, and the outer diameter of the collar portion 24 is larger than the width of the intermediate portion 30.
[ 0025 ]
The stopper portion 25 is narrowed from the intermediate portion 30 to form a square cross section or the like (FIG. 2), extends in the Y axis direction along the A side of the outer peripheral portion 13, and has a tip that is longer than the inner cylinder 2 and in the Y axis direction. It extends to. However, it is slightly shorter than the length of the side of the outer peripheral portion 13 in the A direction. If the distance D to the tip of the stopper 25 on the basis of the mounting surface of the mounting flange 7 on the vehicle body side and the distance to the outer periphery of the inner cylinder 2 in the Y-axis direction and on the side opposite to the mounting flange 7 are d> d.
[ 0026 ]
The intermediate part 30 and the stopper part 25 are connected by a circular arc part 31 to relieve stress concentration. The insert 10 is substantially L-shaped when viewed from above in FIG. Further, the stopper portion 25 is provided with through holes 32 and 32, and during resin molding, the resin passes through the through holes 32 and 33 and continuously connects the front and rear of the stopper portion 25. It has a bond reinforcement structure that strengthens integration.
[ 0027 ]
The stopper portion 25 is inserted into the high strength portion 18, the intermediate portion 30 is inserted into the high strength portion 18 and the mounting flange 7, and the collar portion 24 is inserted into the mounting flange 7. Therefore, as shown in FIG. 3, the insert 10 is inserted in a substantially L shape across the mounting flange 7 from the high-strength portion 18 of the bracket body 6.
[ 0028 ]
As shown in FIG. 4, the rib 21 is integrally formed with an arcuate contour extending from the lower surface side of the bracket main body 6 in the illustrated state to the side surface of the mounting flange 7 on the bracket main body side. The insert 11 is a collar made of metal or the like in which a through hole 34 for a bolt is formed. In the illustrated state, the left and right seating surfaces 35 and 36 have a diameter smaller than that of the intermediate portion 37 to prevent the intermediate portion 37 from being removed. Non-circular and non-rotating.
[ 0029 ]
The left seat surface 35 in the figure is flush with the inner surface of the mounting flange 7, the right seat surface 36 is slightly protruded from the outer surface of the mounting flange 7, and fastening to the vehicle body F side with bolts or the like It is the same. Note that the insert 10 is a deformed member having a substantially different shape from a normal insert collar configured as a single unit, such as an overall L-shape. It is unnecessary. The insert 12 has the same structure as the insert 11.
[ 0030 ]
As shown in FIG. 5, a positioning recess 38 is formed on the side surface of the intermediate portion 30. The positioning recess 38 has a positioning structure at the time of resin molding and is filled with resin. In addition, it functions similarly as a convex part instead of the concave part 38. Further, when the insert 10 is viewed as a collar, it becomes an L-shaped deformed member as compared with a general cylindrical member, and this shape itself also forms a positioning structure.
[ 0031 ]
Next, the operation of this embodiment will be described. In FIG. 1, general vibration in the X-axis direction is absorbed by the elastic vibration-proof rubber 3 being elastically deformed, and a slightly large vibration is absorbed by the elastic deformation of the thick-walled portion 17 against the protruding portion 15 or 16. To do.
[ 0032 ]
When a large impact force is applied to the vehicle body and the inner cylinder 2 moves largely relative to the resin bracket 5 to cause a large displacement that destroys the bracket body 6, The cylinder 2 strongly hits the edge of the mounting hole 14, but a stopper 25 is inserted in the vicinity of the edge to form a high-strength portion 18 reinforced to sufficiently withstand such an impact. Therefore, the destruction with respect to such a large displacement can be avoided.
[ 0033 ]
In addition, since the stopper portion 25 is integrated with the collar portion 24 and is attached to the vehicle body side with the collar portion 24, the strength of the insert 10 itself is increased, and the collar portion 24 and the stopper portion 25 are also used. This can reduce the number of parts. In addition, sufficient strength can be obtained regardless of the layout constraints to provide ribs, and the insert 10 can be made of a relatively small part for the purpose of forming a high strength part. Therefore, the resin bracket 5 does not need to be so thick and can be reduced in weight.
[ 0034 ]
On the other hand, when the large displacement is made in the direction B on the opposite side, the inner cylinder 2 crushes the protrusion 16 and hits the mounting hole 14. At this time, since the highly rigid and easily cracked portion 20 has a structure that is highly rigid and easily cracked, the weakened structure portion including the weld line 22 and the slot hole 23 is cracked against such a large displacement.
[ 0035 ]
However, since the high-rigidity easily cracked portion 20 is reinforced by the ribs 21 and has high rigidity, the rigidity of the resin bracket 5 is increased and contributes to stable support of the heavy engine E except in such a large displacement. is doing. Moreover, by forming the ribs 21, the overall thickness of the high-rigidity easily cracked portion 20 is avoided and the overall weight is reduced.
[ 0036 ]
Note that the weakened structure may not include both the weld line 22 and the slot hole 23 at the same time, but depending on the degree of the high-rigidity structure by the ribs 21, it is possible to make the high-rigidity part easily cracked by either one. it can. Further, by forming the substantially L-shaped insert 10 between the high-strength portion 18 and the mounting flange 7 and the rib 21 across the high-rigidity easily cracking portion 20 and the mounting flange 7, respectively, as shown in FIG. When the main body 6 receives a load in the Z-axis direction, the resin bracket 5 is cantilevered by the mounting flange 7, but can provide sufficient support rigidity to the load in this direction. 7 can sufficiently withstand the swinging motion with the fastening point 7 as a fulcrum and the inner cylinder 2 as an action point.
[ 0037 ]
Thus, with respect to one resin bracket 5, the A direction side can be made the high strength portion 18 by the insert 10 and the B direction side can be made the highly rigid easily cracked portion 20 with the anti-vibration rubber 3 interposed therebetween. Note that the high-strength portion 18 and the high-rigidity easily cracked portion 20 do not have to be provided on one resin bracket 5 at the same time, and the high-rigidity easily-cracked portion 20 can be omitted. The resin bracket 5 does not necessarily have an L shape, and may be a flat shape in which the bracket body 6 and the mounting flange 7 are in the same plane.
[ 0038 ]
In addition, a high strength portion 18 is provided on one side of the resin bracket 5 with the anti-vibration rubber 3 interposed therebetween, and a high rigidity portion 20 reinforced with a rib shape is provided on the other side, and the high rigidity portion 20 is provided. Since the high-strength portion 18 is provided in a portion smaller than the existing area, a sufficiently large strength is given even to a small area portion where sufficient rib shape reinforcement cannot be performed in order to obtain the required strength due to layout restrictions. Can do.
[ 0039 ]
However, the area of the high-strength portion 18 does not necessarily need to be smaller than that of the high-rigidity portion 20. Regardless of the size of the area, by providing the high-strength portion 18 and the high-rigidity portion 20, The characteristics of the resin bracket 5 can be varied according to the input direction. Moreover, the high-strength portion 18 can be easily provided by using the metal insert 10 in which the collar 24 forming the mounting seat is integrated.
[ 0040 ]
Furthermore, a substantially L-shaped insert 10 in which a stopper 25 and a collar 24 forming a mounting seat are integrated is embedded in a resin bracket 5 having a substantially L shape in which the bracket body 6 and the mounting flange 7 are integrated. As a result, sufficient support rigidity can be provided in spite of the cantilever support of the engine, and it is sufficient for a swinging motion with the mounting portion of the mounting flange 7 as a fulcrum and the engine connecting portion of the bracket body 6 as an operating point. Can withstand.
[ 0041 ]
Moreover, since the insert 10 has its own L-shaped irregular shape and the concave portion 38 as a positioning structure at the time of resin molding, the stopper function can be effectively exhibited by the positioning structure when used as an engine mount after resin molding.
[ 0042 ]
Further, since the insert 10 has a structure for strengthening the connection with the resin formed of the through holes 32 and 33, the insert 10 and the resin are firmly bonded and integrated at the time of resin molding, and the strength and rigidity can be increased.
[Brief description of the drawings]
FIG. 1 is a plan view of an engine mount. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 5] Perspective view of stopper 【Explanation of symbols】
1: engine mount, 2: inner cylinder, 3: anti-vibration rubber, 4: rubber foot, 5: resin bracket, 6: bracket body, 7: mounting flange, 10: metal insert, 13: outer periphery, 14: Mounting hole, 15: protruding portion, 16: protruding portion, 17: thick portion, 18: high strength portion, 20: highly rigid easily cracked portion, 21: rib, 22: weld line, 23: slot hole, 24: mounting A collar forming a seat, 25: a stopper portion, 32, 32: a through hole.

Claims (4)

In an engine mount configured to support the engine via a vibration isolating rubber provided on the resin bracket, and to be displaceable in a direction in which the engine support portion opposes within the vibration isolating rubber support surface of the resin bracket,
In the vicinity of the anti-vibration rubber of the resin bracket, only one of the opposing displacement directions of the engine support point is made a high-strength portion as a metal insert with an integrated stopper and mounting seat , and the other The side is a highly rigid part reinforced with ribs,
The area of the portion where the high strength portion is provided is smaller than the area of the portion where the high rigidity portion is provided,
An engine mount characterized by that . The resin bracket described in claim 1 includes a bracket body portion that supports the vibration isolating rubber, and a mounting flange for mounting to the support member, and the bracket body portion and the mounting flange are substantially L-shaped, In the engine mount, the metal insert has a substantially L-shaped stopper and a mounting seat inserted into the flange. The engine mount according to claim 1 or 2, wherein the metal insert has a positioning structure during resin molding. The engine mount according to claim 1 or 2, wherein the metal insert has a structure for strengthening a bond with a resin through a through hole.

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